﻿using Microsoft.AspNetCore.Http;
using System.Collections.Specialized;
using System.Text;
using System.Web;

namespace EU.Core.Serilog.Es.HttpInfo;

/// <summary>
/// 获取参数帮助类
/// </summary>
public class ParamsHelper
{
    /// <summary>
    /// 获取参数值
    /// </summary>
    /// <param name="context"></param>
    /// <returns></returns>
    public static string GetParams(HttpContext context)
    {
        try
        {
            NameValueCollection form = HttpUtility.ParseQueryString(context.Request.QueryString.ToString());
            HttpRequest request = context.Request;

            string data = string.Empty;
            switch (request.Method)
            {
                case "POST":

                    request.Body.Position = 0;
                    using (var ms = new MemoryStream())
                    {
                        request.Body.CopyTo(ms);
                        var b = ms.ToArray();
                        data = Encoding.UTF8.GetString(b); //把body赋值给bodyStr
                        
                    }
                    break;
                case "GET":
                    //第一步：取出所有get参数
                    IDictionary<string, string> parameters = new Dictionary<string, string>();
                    for (int f = 0; f < form.Count; f++)
                    {
                        string key = form.Keys[f];
                        parameters.Add(key, form[key]);
                    }

                    // 第二步：把字典按Key的字母顺序排序
                    IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(parameters);
                    IEnumerator<KeyValuePair<string, string>> dem = sortedParams.GetEnumerator();

                    // 第三步：把所有参数名和参数值串在一起
                    StringBuilder query = new StringBuilder();
                    while (dem.MoveNext())
                    {
                        string key = dem.Current.Key;
                        string value = dem.Current.Value;
                        if (!string.IsNullOrEmpty(key))
                        {
                            query.Append(key).Append("=").Append(value).Append("&");
                        }
                    }
                    data = query.ToString().TrimEnd('&');
                    break;
                default:
                    data = string.Empty;

                    break;
            }
            return data;
        }
        catch(Exception)
        {
            return string.Empty;
        }
    }

}
